On Monday, April 16, 2012 06:15:29 AM Andrew did opine: > 15 ذ؛ذ²ر–ر‚ذ½رڈ 2012 ر€. 19:49 andy pugh <bodge...@gmail.com> ذ½ذ°ذ؟ذ¸رپذ°ذ²: > > You need to Halscope the encoder pins (dmesg should tell you which > > gpio pins correspond to the encoder phases) and see if there is a good > > quadrature signal getting into LinuxCNC. > > Here's the halscope > http://img35.imageshack.us/img35/3557/screenshot1kq.png(pins 12 and 13 > supposed to be A and B)
Looks like it is but those slow rise & fall times (looks to be slew rate limited), coupled with the non-50% duty cycle, could be problematic. Who made that encoder? For a scope shot of the opto based one I built, see on my page in the sig, at Genes-os9-stf/eagle/quadrature-waveform.JPG where you can see the nearly 50% duty cycle, and near 90 degree quadrature of the 2 signals. This seems to track well all the way to 2500 rpm, that spindles top speed. > I do not understand what's going on. When I change counter-mode to 1 it > counts only in one direction, and 4 times less distance. Expected I believe but check the HAL manual, its much more accurate than my aging memory. > I.e. probably > channel A is OK, but it does not see B. > I checked the encoder connection to 7i39 many times. And just checked > this encoder perfectly works with 7i48. > Could it be pinout error in 7i39 manual or firmware? Anyone has working > config for 7i43+7i39? > > Too bad I have not received yet my ordered o-scope to check the signal > on encoder output pins... > > Andrew Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Earn cash in your spare time -- blackmail your friends. ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
